The stair stringer bears on a 3-inch by 3-inch by 1/4-inch angle measuring 0 feet 4 inches long, welded with a 1/4-inch fillet weld and connected to the concrete slab-on-grade with a 3/4-inch diameter expansion bolt placed into a 2-inch long-slotted hole. The assembly sits atop a 12-inch thick thickened slab footing reinforced with two continuous number 4 reinforcing bars.
L3x3x1/4 x 0'-4" WITH 3/4"DIA EXPANSION BOLT 1/4 THICKENED SLAB FTG WITH (2) #4 x CONT BARS CONCRETE SLAB ON GRADE, SEE PLAN STAIR STRINGER, SEE ARCH INTO 2" LONG-SLOTTED HOLE 12" 18"
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